Relative seismic and tsunami risk assessment for Stromboli Island (Italy). (15th June 2022)

• Record Type: Journal Article
• Authors: Turchi, Agnese; Di Traglia, Federico; Gentile, Roberto; Fornaciai, Alessandro; Zetti, Iacopo; Fanti, Riccardo
• Is Part Of: International journal of disaster risk reduction. Volume 76(2022)
• Publication Date: 2022-06-15
• Subjects: Relative risk assessment -- Seismic risk -- Tsunami risk -- Volcanic islands -- Stromboli -- Aeolian archipelago; Emergency management -- Periodicals; Risk management -- Periodicals; Disaster relief -- Periodicals; Hazard mitigation -- Periodicals; 363.34
• DOI: 10.1016/j.ijdrr.2022.103002
• Languages: English
• ISSNs: 2212-4209

Abstract

Abstract: An innovative method of estimating the relative risk of buildings exposed to seismic and tsunami hazards in volcanic islands is applied to Stromboli (Italy), a well-known stratovolcano affected by moderate earthquakes and mass-flow-induced tsunamis. The method uses a pre-existing quali-quantitative analysis to assess the relative risk indices of buildings, which provide comparative results useful for prioritisation purposes, in combination with a historical-geographical settlement analysis consistent with the 'territorialist' approach to the urban and regional planning and design. The quali-quantitative analysis is based on a new proposed survey-sheet model, useful to collect building information necessary for the relative risk estimation, whereas the historical-geographical investigation is based on the multi-temporal comparison of aerial and satellite images. The proposal to combine two consolidated methods represents an innovation in estimating relative risk. Considering that Stromboli Island had never been subjected to similar analyses, the results of the relative seismic risk assessment are novel and moreover identify buildings with a fairly-low and spatially-uniform relative risk. The results of the relative tsunami risk assessment are consistent with results of similar past studies, identifying buildings with a higher relative risk index on the northern coast of the island. The combined use of a building-by-building survey with a multi-temporal analysis of settlements allows obtaining a higher detail than previously available for the region. If adequately modified, the proposed combination of methods allows assessing relative risk also considering other geo-environmental hazards and their cascading effects, in a multi-hazard risk assessment perspective.